Means for preventing offset.



G. G. MURRAY.

MEANS FOR FREVENTNG OFFSET.

APPLICATION FILED JAN.27,1906,

To all 'whom l for manip atin PATE-Nrormcn @51cm-LY, orfmm- Be it knownthat I, Gronau a-,citizen of. the United States,r and a resident ofLarchmont, county of Westchester, and State of New York, have inventedcer-- tainnew and useful, Improvements ini .Meansrfor lPreventingOffset, of which the following, is a specification. y i 'Myfinventionrel tes to the preventionvofI offset; printing* ressesand other mecha.

the same partie ar y useful as carout in connection. with presses for py printin 'on both sides of paper or similar materi In presses of tinscharacter andi various mechanisms Ifor mani ulatingf. printed material7and especiall f res print-l ed paper, as for example de iver mechanismsof printing pressesand fo1d1ngmechanismsif the inkbearing surface of theprinted materialY comes in contact wlth any' art of the mechanism someof the' inkmay' transferred to such part, especially where there is anylpressure exerted between the contacting surfaces, and after `a certainamount of ink has been thus transferred it begins to lset of or oifset,asit is termed, .unto the passing material; Great' diiiiculty1 has beenexperienced in prevent this oii'set, especia y in the iiner classes ofprinting, where not only is the oset morel apt to occurby reason of thenaturev of the materials used but even .a slight` amount of. defaoemcntdue to ofset consti? tutes a most serious defect. Although much:amention,` has beenv paid to this matter by those skilled in the art, nosolutionof` the problemA has been-.reached which is generallyapplicable, and. particularly which will per.- mit of the iiner gradesof printingv being performed on perfecting presses, land articularly on-rotary perfectm presses w 'ere the, impressions on the opposlte sidesof the paper. are'eected in'substantiall' instantaneous' succession,'.and `*where e printed'- productv cannot be' manipulated, as in `foldmg.or delivering `,withoutcontact' with the fresh printed sur aces. n v

My invention. hasl forl an ob'ect to produce means whereby the deacement of printedv4 matter by' odset may be efectively prevented, and.more particularly to rovide means whereby o'setting may be e ectivelyprevented without inf any manner injuring camminano: umarmenTippmann-anc January a7, isos. semina, esame. j

G; Mumien rinted material sroafrnnvnmeme y Q Patented'. Jan. 21, 1ers.r

-'material, whereby the complicat 'and expensive mechanisms now commonlyused 'for ythis purpose may be dispensed' with.

These and? other objects of the invention 'will 1n part be obvious and'in -part be pomted out inthe followin' "description 4 I havefound thater' of ink from fa printed' surface to a ,surface with which it comes mcontact. will' not take place, to a harmful extent', at' least, `in thepresence of a stable emulsion, even where the surfaces are fbrought intocontact under heavy pressure, Isuch 'for.e1m.mple a's exists` between animpression surface and' [the material being printed thereon. #To obtainood" results-the surfaceof the-member to wich the emul- Qsion is appliedis preferably slightly roughen'ed or grained or mad'etoA a certainextent porous so that' it will more readily carry a ,suitable quantit-yor supply of the emulslon. I n the case of an impression member ofl arintin press, moreover,the surface should e yiel in yor flexible orof'such a nature that it wi 'properly support the paperI or othermaterial to Ibe printed in contact with the design member, and where theusual pacling 1s employed on the impression mem- 'ber the emulsioncarrying member should be impervious tothe emulsion so as to preiventthe destruction or impairment of lthe jpacking materials.

I have found an emulsion or a mixture of oil and water or similarsubstances in the 'nature of an emulsion, and particularl an emulsion orsimilar com ound of hoile linseed oil, or linseed Aoil o like character,and water, to give good results when used in `connection with theimpression member of a printing press, the proportions em loyed @beingone part of oil to three parteci water 'with a little caustic soda t'ofacilitate the ,emulsication of the oil in the water. Where boiledlinseed oil is employed, it is preferably used in a substantially purecondition, the oxidizing agents commonly found in the boiled hnseed` oilof commerce being omitted. The emulsion may, however, be

a machine b which my method mayr be carried into e ect and whichconstitutes `one embodiment of other features of the tion.

Of the drawings, Figure 1 is a view partly diagrammatic andpartlysectional illustratingfa printing press constructed in accordancewith my invention, land Fig. 2 is a sectional view on an enlarged scaleillustratingin more detail one of the impression members of the press.

Referring to the drawings in detail, the press there shown com rises animpression cylinder l around whic are arranged a series of designcylinders 2 adaptedtoy rint -`afseries of impressions on one side o thepaper. As shown, this press is intended to prmt upon paper or similarmaterial 'in web form, the web being continuously su plied fromaroll 3.After passin around t ev cylinder l and receivin severa im ressions.

from the design cylin ers, the we passes between the impression anddesign membersl 4 and 5, respectively, of a second printing mechanismwhereby it receives impressions upon its opposite side.

to a suitable delivery mechanism, that shown including a set ofconveying tapes 6 and a set of 'cutters 7.

' To revent o'set of ink' from the lrst printe side of the web to thesurface 4of the impressionmember 4, the surface of the latter kissupplied or provided with the emulsion. This may be accom lished in anysuitable way. In the particular construction shown there is placed overthe usual packing ing 8 of the cylinder a sheet or member 9 of materialwhichI is impervious to theemulsion and which is at the same timeprovided with asuitable porous or grained surface adapting it to carry asuitable quantity or supply of the emulsion without liability oftransferring the same to 'a harmful extent to the surface of the pa eror material being printed. Preferably, thls layer or member 9 should beflexible and yet not sufficiently soft or yielding to prevent the properimpression of the design upon the paper.

I have found certain forms of artificial leatherl used for book bindingand other purposes to give satisfactory results. lVhere the impressioncylinder is used in connection emulsion.

After leaving the second printing mechanism, the web vpasseswith arelief im ression surface, I haveemployed an arti cial leatherknown tothe trade.as pantasote to answer the purpose, the heavy. cloth basiclayer of this material bein removed, if desired, to make the ma- 'terialess soft and yielding. rlhis material affords a surface which issuitably porous or grained and at the same time the material 1sinsoluble in and impervious to an Aemulsion of boiled linseed oil andwater.

Any suitable means may be provided for maintaining a supply of emulsionon the impression surface. As shown, a simple liquid ist-ributingmechanism is employed for the purpose, thesame consistin of distributingand ,applying rollers 10 an 11, a fountain 12, and an intermittentlyoperated convevin or ductor roller 13. l y

t will be understood that my invention may be carried out in connectionwith other surfaces which come inl contact with or manipulate theprinted material. As shown,

for example, the, delivery tapes' 6 which serve to convey the printedmaterial from the second printing couplje to thepcutters 7 may -be.supplied with an ink repellent p In accordance with the preferredconstruction these tapes are formed of a material whichis impervious tothe emulsion and affords a suitably grained surface. For example, they.may be made of or provided with a surface member of the arti-v cialleather referred to, and suitable means as the applying roller 14,fountain 1'5,`an`d ductor 16 may be provided to maintain a supply ofemulsion thereon.

It will be understood that my invention in.

its broader aspects is not limited to the precise com ounds or devicesherein specifi-- cally set orth, as many changesmay be'made respectinthe materlals and constructions .em loyer? in carrying out m inventionwit out de arting from the main principles thereof an withoutsacrificing its chief advantages. o

What I claim is:

' 1, An antioset device consisting of a member for manipulating printedmaterial, said member having its bearing surface provided with a stableemulsion.

2. An antioifset device consisting of .a

member for manipulating printed'material, said member havin its bearingsurface provided with an emu sion of oil and water.

. 3. An antioiset device consisting of 'a4 member for manipulatingprinted material, said member havin its bearin surface r0- vided with anemu sion of boi ed linsee oil and water.

4. device for reventing offset consisting of a member or manipulatingprinted material, said member havin a suitably grainedv surface providedwith a stable emulsion.

5. An antioset impression member havlessees ing is suifaee provie wth e.stabie emusion.

6. .6m sniofse impression membe navei? oil emi weten entiofse imgnessionmembe naving i'ss suiaoe povie with am emulsion oz" boiie iiixseefi @iiami water.

8. 5.11 azitioise impression device having e, suece ovide with e Smbieemusien, seii es'ice being impeivieus the emusien.

9. pining ess ineuiiing in combineion, es iizepessiem membe having iisss?- see pievi e eil emuisioi oi esiiesi iiasee @ii and issie?, :m means:for meisaiiiing s suppijf ci; emulsion se sai s aee seifi Azlfleiizbebeing impewiozis the emuision.

il @fining press iiie'uilig is combisu'eee pevideci Wih am emulsion ofboiled lef. ing pi'ess inciuciing in combinaiois, mesas e making s,puiaiiy of impessions apen ene sie of the maei'iui, and means is?pin'ing iie opposie side of iie ai e impressies member of said ias@name@ mesas having ils su'iface pievide Wiiz s s ie emuisioi.

an-iosed vice consisting of e Ins-mise? foi manipuiating piined meeiiei,

mem e? having an oue? iayei" with impression membei imi'- mg suie?iieziibielsyer healing a sui'm'z-i A ien, kiffe? being impervious i0les.

iii es-imony wiieeof, have signe name is Tis speeicaion, in the presence@i "me Subsc-sisiiig ,iiiesses.

